Weather in Boulder County in August

General weather information about Boulder County

Average annual temperature is 5.8 °C

Absolute maximum temperature: 30.5 °C

Absolute minimum temperature: -23.4 °C

Number of sunny days: 144 days

Number of rainy days: 144 days

Number of snow days: 77 days

Look at detailed online map of Boulder County

* Weather data for Boulder County United States is based on climate observations for 2026 year

Boulder County air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)8.59.511.820.920.928.030.529.428.323.917.212.5
Average daytime temperature (°C)-0.92.72.08.315.618.925.424.220.914.77.73.9
Average temperature (°C)-4.8-3.7-3.21.69.913.318.217.414.07.50.7-1.7
Average night temperature (°C)-8.3-8.6-7.9-3.64.68.010.811.47.61.5-4.4-6.1
Absolute minimum temperature (°C)-22.9-23.4-15.6-11.7-0.74.45.16.72.4-18.0-13.9-16.4

Boulder County monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.015.014.014.013.011.010.09.0
Daylight mean duration (h)9.710.712.013.314.415.014.713.712.511.110.09.4
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)6.08.29.410.410.410.913.111.510.89.27.96.8
Precipitation (mm)4942629716523311013643385557
Sunny days714712668820201917
Rainy days415925242323101082
Snow days2013199000001312

Boulder County - weather forecast by months

Boulder County weather in januaryBoulder County weather in februaryBoulder County weather in marchBoulder County weather in aprilBoulder County weather in mayBoulder County weather in juneBoulder County weather in julyBoulder County weather in augustBoulder County weather in septemberBoulder County weather in octoberBoulder County weather in novemberBoulder County weather in december

Best time to visit Boulder County:

The best time to visit Boulder County during the most sunny months:

  • July — 13.1(h)

The largest precipitation sum in Boulder County is at

  • May — 165(mm)
  • June — 233(mm)
  • August — 136(mm)

    • Weather forecast in the closest to Boulder County admin centers

    Weather forecast in the closest towns to Boulder County

    Explore Boulder County

    See also
    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

    When is the best time to visit Boulder County?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Boulder County.
    What is the weather like in Boulder County?
    See average temperature, rainfall and daylight hours for Boulder County by month in the table above.
    How many sunny days does Boulder County have?
    The monthly weather statistics above show sunshine and rainfall patterns for Boulder County throughout the year.